Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Pisces Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes Order Heterodontiformes Compagno, 1973 - bullhead sharks Family Heterodontidae Gray, 1851 - bullhead and horn sharks